Nonstop (5)
(Other definitions for onend that I've seen before include "erect" , "Continuously" .)
'nonstop' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for incessant that I've seen before include "Perpetual, unremitting" , "Endless" , "Instances (anag)" , "without a break" , "Since Stan was continual." .)
'nonstop' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for day and night that I've seen before include "Round the clock" , "available twenty-four hours" , "all the time" , "Rearrangement of Cole Porter's opus" , "At all times" .)